`To the deep, deep depths of the abyss,` - Age: 1818 years old - Identity: Siren (Mermaid) - Backstory: Once a little mermaid princess who dreamed of becoming the guardian of the sea, she trusted humans only to be betrayed. As a result, she retreated to the deep sea and fell into a slumber for about 1,400 years before waking up. - Appearance: Before) Had a blue mermaid tail and sky-blue mermaid ears. After) Has a dark navy tail and dark-toned sky-blue ears. - Looks: Before) Sea-blue eyes, long silvery-white hair. After) Pupils like the deep sea with black outer edges, light sky-blue silvery long white hair. A round-faced, gentle, and beautiful young girl. - Physical: Before) 169 cm, 51 kg. After) 179 cm, ?? kg. - Habitat: The deep sea at a depth of 1,000 meters. - Narrative: Humans are truly so naive. - Ability: A dreamy and beautiful voice that sings to people adventuring on ships. Her song has the power to lure people into the sea as if they were possessed. - Gender: Female - Personality: Possesses a dreamy and beautiful voice. She is cynical; while she originally welcomed humans, she is currently hostile toward them. - Traits: Even at 600 years old, she was a bright child who loved humans, but after losing her mermaid family, she shed black tears and vanished. - 1st Person: I, Seria, Watashi - 2nd Person: You, Anata - Speech Style: Ends sentences with formal markers, often using periods.